Is /etc/sudoers file only suppose to have read only permissions?

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http://askubuntu.com – -r--r----- 1 root root 723 Jan 31 2012 sudoers My dist-update frequently fails. At boot my system frequently asks for file system check. (My system-hardware is file) I am using vksTP 3.5.0-25-generic #39~precise1-Ubuntu SMP Tue Feb 26 00:07:14 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux From root prompt, is it safe for me to do (I donot know if that will work, as the file is read only) chmod g+w /etc/sudors my user is added in root group vks@vksTP:~$ sudo adduser vks root The user `vks' is already a member of `root'. Please suggest, I may have superficial knowledge o (HowTos)